Tuakana-Teina relationship and leadership in ancient Mangaia and Aotearoa.

The relationship between tuakana and teina (the older and younger sibling or cousin of same sex) is the tumu (foundation, origin, cause) of rank in eastern Polynesia. By examining historical documents from selected island societies, namely, Mangaia and Aotearoa, we can understand the dynamics of this relationship as part of their world-view. Normally tuakana and teina had close, cooperative, mutually respectful and loyal relationships; the teina supporting their elder. Sometimes, however, the moral balance between them was affected either by one of them acting inappropriately towards the other, or by hostile acts from others. To remedy these threats to social cohesion, various strategies were adopted, including peace-making, flight or spatial separation, or fighting. Stories about this relationship continue to serve as the tumu for today's younger generations.